U.S. patent number 9,588,321 [Application Number 15/186,846] was granted by the patent office on 2017-03-07 for imaging lens system, image capturing unit and electronic device.
This patent grant is currently assigned to LARGAN PRECISION CO., LTD.. The grantee listed for this patent is LARGAN PRECISION CO., LTD.. Invention is credited to Wei-Yu Chen, Chun-Che Hsueh.
United States Patent |
9,588,321 |
Hsueh , et al. |
March 7, 2017 |
**Please see images for:
( Certificate of Correction ) ** |
Imaging lens system, image capturing unit and electronic device
Abstract
An imaging lens system includes, in order from an object side to
an image side, a first lens element, a second lens element, a third
lens element, a fourth lens element, a fifth lens element and a
sixth lens element. The first lens element with positive refractive
power has an object-side surface being convex in a paraxial region
thereof. The second lens element has refractive power. The third
lens element with refractive power has an image-side surface being
concave in a paraxial region thereof. The fourth lens element has
refractive power. The fifth lens element with positive refractive
power has an object-side surface being convex in a paraxial region
thereof. The sixth lens element with negative refractive power has
an image-side surface being concave in a paraxial region thereof,
wherein the image-side surface of the sixth lens element has at
least one convex shape in an off-axis region thereof.
Inventors: |
Hsueh; Chun-Che (Taichung,
TW), Chen; Wei-Yu (Taichung, TW) |
Applicant: |
Name |
City |
State |
Country |
Type |
LARGAN PRECISION CO., LTD. |
Taichung |
N/A |
TW |
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Assignee: |
LARGAN PRECISION CO., LTD.
(Taichung, TW)
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Family
ID: |
55375131 |
Appl.
No.: |
15/186,846 |
Filed: |
June 20, 2016 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20160291294 A1 |
Oct 6, 2016 |
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Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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14526219 |
Oct 28, 2014 |
9395519 |
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Foreign Application Priority Data
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Aug 29, 2014 [TW] |
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103129947 A |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B
13/0045 (20130101); G02B 9/62 (20130101); G02B
27/0025 (20130101) |
Current International
Class: |
G02B
3/02 (20060101); G02B 13/00 (20060101); G02B
9/62 (20060101); G02B 27/00 (20060101) |
Field of
Search: |
;359/713 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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204302563 |
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Apr 2015 |
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CN |
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2014-010399 |
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Jan 2014 |
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JP |
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2014-010400 |
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Jan 2014 |
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JP |
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2014-010401 |
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Jan 2014 |
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JP |
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2014-044372 |
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Mar 2014 |
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JP |
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2014-059561 |
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Apr 2014 |
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JP |
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201239445 |
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Oct 2012 |
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TW |
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201250283 |
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Dec 2012 |
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TW |
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201413320 |
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Apr 2014 |
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TW |
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201415074 |
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Apr 2014 |
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TW |
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Primary Examiner: Jones; James
Attorney, Agent or Firm: Maschoff Brennan
Parent Case Text
RELATED APPLICATIONS
This application is a continuation patent application of U.S.
application Ser. No. 14/526,219, filed on Oct. 28, 2014, which
claims priority to Taiwan Application 103129947, filed on Aug. 29,
2014, which is incorporated by reference herein in its entirety.
Claims
What is claimed is:
1. An imaging lens system comprising, in order from an object side
to an image side: a first lens element with positive refractive
power having an object-side surface being convex; a second lens
element having positive refractive power; a third lens element
having an object-side surface being convex; a fourth lens element
with positive refractive power having an object-side surface being
convex; a fifth lens element having an object-side surface being
convex; and a sixth lens element having an image-side surface being
concave in a paraxial region thereof, wherein the image-side
surface of the sixth lens element has at least one convex shape in
an off-axis region thereof, and an object-side surface and the
image-side surface of the sixth lens element are both aspheric;
wherein the imaging lens system has a total of six lens elements,
an air gap in a paraxial region is between any two of the first
lens element, the second lens element, the third lens element, the
fourth lens element, the fifth lens element and the sixth lens
element that are adjacent to each other, and an axial distance
between the first lens element and the second lens element is
larger than an axial distance between the fifth lens element and
the sixth lens element; wherein a focal length of the first lens
element is f1, a focal length of the second lens element is f2, an
axial distance between the object-side surface of the first lens
element and an image surface is TTL, a maximum image height of the
imaging lens system is ImgH, and the following conditions are
satisfied: f2/f|<1.60; and TTL/ImgH<3.0.
2. The imaging lens system of claim 1, wherein the second lens
element has an object-side surface being convex.
3. The imaging lens system of claim 2, further comprising an
aperture stop disposed between an imaged object and the third lens
element.
4. The imaging lens system of claim 3, wherein the first lens
element has an image-side surface being concave.
5. The imaging lens system of claim 1, wherein a central thickness
of the fifth lens element is larger than a central thickness of the
sixth lens element.
6. The imaging lens system of claim 1, wherein a focal length of
the imaging lens system is f, a focal length of the fifth lens
element is f5, a focal length of the sixth lens element is f6, and
the following condition is satisfied:
3.0<|f/f5|+|f/f6|<7.5.
7. The imaging lens system of claim 1, wherein the third lens
element has negative refractive power, and the third lens element
has an image-side surface being concave.
8. The imaging lens system of claim 1, wherein the sixth lens
element has negative refractive power.
9. The imaging lens system of claim 1, wherein an axial distance
between the object-side surface of the first lens element and the
image-side surface of the sixth lens element is TD, an entrance
pupil diameter of the imaging lens system is EPD, and the following
condition is satisfied: TD/EPD<2.50.
10. The imaging lens system of claim 1, wherein the fifth lens
element has an image-side surface having at least one inflection
point in an off-axis region thereof.
11. The imaging lens system of claim 1, wherein a central thickness
of the fifth lens element is CT5, a central thickness of the sixth
lens element is CT6, the axial distance between the fifth lens
element and the sixth lens element is T56, and the following
condition is satisfied: 0.70<CT5/(T56+CT6).
12. The imaging lens system of claim 1, wherein the axial distance
between the first lens element and the second lens element is T12,
an axial distance between the second lens element and the third
lens element is T23, an axial distance between the third lens
element and the fourth lens element is T34, an axial distance
between the fourth lens element and the fifth lens element is T45,
the axial distance between the fifth lens element and the sixth
lens element is T56, and the following condition is satisfied:
1.5<(T34+T45)/(T12+T23+T56).
13. An image capturing unit, comprising: the imaging lens system of
claim 1; and an image sensor, wherein the image sensor is disposed
on the image side of the imaging lens system.
14. An electronic device, comprising: the image capturing unit of
claim 13.
15. An imaging lens system comprising, in order from an object side
to an image side: a first lens element with positive refractive
power having an object-side surface being convex; a second lens
element with positive refractive power having an image-side surface
being convex; a third lens element; a fourth lens element having an
object-side surface being convex; a fifth lens element; and a sixth
lens element having an image-side surface being concave in a
paraxial region thereof, wherein the image-side surface of the
sixth lens element has at least one convex shape in an off-axis
region thereof, and an object-side surface and the image-side
surface of the sixth lens element are both aspheric; wherein the
imaging lens system has a total of six lens elements, an air gap in
a paraxial region is between any two of the first lens element, the
second lens element, the third lens element, the fourth lens
element, the fifth lens element and the sixth lens element that are
adjacent to each other, and a central thickness of the fifth lens
element is larger than a central thickness of the sixth lens
element; wherein a focal length of the imaging lens system is f, a
focal length of the first lens element is f1, a focal length of the
second lens element is f2, an axial distance between the
object-side surface of the first lens element and an image surface
is TTL, a maximum image height of the imaging lens system is ImgH,
a curvature radius of the object-side surface of the fourth lens
element is R7, a curvature radius of an image-side surface of the
fourth lens element is R8, an axial distance between the
object-side surface of the first lens element and the image-side
surface of the sixth lens element is TD, an entrance pupil diameter
of the imaging lens system is EPD, and the following conditions are
satisfied: TD/EPD.ltoreq.1.95; f2/f1.ltoreq.0.69; TTL/ImgH<3.0;
and |f/R7|+|f/R8|<0.80.
16. The imaging lens system of claim 15, wherein the second has an
object-side surface being convex.
17. The imaging lens system of claim 15, further comprising an
aperture stop disposed between an imaged object and the third lens
element.
18. The imaging lens system of claim 15, wherein the first lens
element has an image-side surface being concave.
19. The imaging lens system of claim 15, wherein the focal length
of the imaging lens system is f, a focal length of the fifth lens
element is f5, a focal length of the sixth lens element is f6, and
the following condition is satisfied:
3.0<|f/f5|+|f/f6|<7.5.
20. The imaging lens system of claim 15, wherein the third lens
element has negative refractive power.
21. The imaging lens system of claim 15, wherein the sixth lens
element has negative refractive power.
22. The imaging lens system of claim 15, wherein the fifth lens
element has an image-side surface having at least one inflection
point in an off-axis region thereof.
23. The imaging lens system of claim 15, wherein the central
thickness of the fifth lens element is CT5, the central thickness
of the sixth lens element is CT6, an axial distance between the
fifth lens element and the sixth lens element is T56, and the
following condition is satisfied: 0.70<CT5/(T56+CT6).
24. The imaging lens system of claim 15, wherein an axial distance
between the object-side surface of the first lens element and an
image-side surface of the third lens element is Dr1r6, an axial
distance between the image-side surface of the third lens element
and an object-side surface of the fifth lens element is Dr6r9, and
the following condition is satisfied:
0.8<Dr1r6/Dr6r9<1.2.
25. The imaging lens system of claim 15, wherein an axial distance
between the first lens element and the second lens element is T12,
an axial distance between the second lens element and the third
lens element is T23, an axial distance between the third lens
element and the fourth lens element is T34, an axial distance
between the fourth lens element and the fifth lens element is T45,
an axial distance between the fifth lens element and the sixth lens
element is T56, and the following condition is satisfied:
1.5<(T34+T45)/(T12+T23+T56).
26. An image capturing unit, comprising: the imaging lens system of
claim 15; and an image sensor, wherein the image sensor is disposed
on the image side of the imaging lens system.
27. An electronic device, comprising: the image capturing unit of
claim 26.
Description
BACKGROUND
Technical Field
The present disclosure relates to an imaging lens system, an image
capturing unit and an electronic device, more particularly to an
imaging lens system and an image capturing unit applicable to an
electronic device.
Description of Related Art
In recent years, with the popularity of electronic devices having
camera functionalities, the demand of miniaturized optical systems
has been increasing. The sensor of a conventional optical system is
typically a CCD (Charge-Coupled Device) or a CMOS (Complementary
Metal-Oxide-Semiconductor) sensor. As the advanced semiconductor
manufacturing technologies have allowed the pixel size of sensors
to be reduced and compact optical systems have gradually evolved
toward the field of higher megapixels, there is an increasing
demand for compact optical systems featuring better image
quality.
A conventional optical system employed in a portable electronic
product mainly adopts a five-element lens structure. Due to the
popularity of mobile terminals with high-end specifications, such
as smart phones, tablet personal computers and wearable apparatus,
the requirements for high resolution and image quality of present
compact optical systems increase significantly. However, the
conventional optical systems cannot satisfy these requirements of
the compact optical systems.
Other conventional compact optical systems with six-element lens
structure are developed to enhance resolution and image quality.
However, the refractive power is overly concentrated at an object
side so as to increase the sensitivity of the optical system.
Furthermore, the fifth lens element in the conventional optical
system is usually a meniscus lens with high thickness ratio for
focusing on an object, whereby it is unfavorable for molding the
fifth lens element, which affects the assembling of the optical
system.
SUMMARY
According to one aspect of the present disclosure, an imaging lens
system includes, in order from an object side to an image side, a
first lens element, a second lens element, a third lens element, a
fourth lens element, a fifth lens element, and a sixth lens
element. The first lens element with positive refractive power has
an object-side surface being convex in a paraxial region thereof.
The second lens element has positive refractive power. The third
lens element with refractive power has an image-side surface being
concave in a paraxial region thereof. The fourth lens element has
refractive power. The fifth lens element with positive refractive
power has an object-side surface being convex in a paraxial region
thereof. The sixth lens element with negative refractive power has
an image-side surface being concave in a paraxial region thereof,
wherein the image-side surface of the sixth lens element has at
least one convex shape in an off-axis region thereof, and both of
an object-side surface and the image-side surface of the sixth lens
element are aspheric. The imaging lens system has a total of six
lens elements with refractive power. An air gap in a paraxial
region is between any two of the first lens element, the second
lens element, the third lens element, the fourth lens element, the
fifth lens element and the sixth lens element that are adjacent to
each other. When a curvature radius of the object-side surface of
the fifth lens element is R9, a curvature radius of an image-side
surface of the fifth lens element is R10, a central thickness of
the fifth lens element is CT5, a central thickness of the sixth
lens element is CT6, an axial distance between the fifth lens
element and the sixth lens element is T56, a focal length of the
first lens element is f1, a focal length of the second lens element
is f2, an axial distance between the object-side surface of the
first lens element and an image surface is TTL, a maximum image
height of the imaging lens system is ImgH, the following conditions
are satisfied: (R9+R10)/(R9-R10)<0.80; 1.35<CT5/(T56+CT6);
f2/f1<1.60; and TTL/ImgH<3.0.
According to another aspect of the present disclosure, an imaging
lens system includes, in order from an object side to an image
side, a first lens element, a second lens element, a third lens
element, a fourth lens element, a fifth lens element, and a sixth
lens element. The first lens element with positive refractive power
has an object-side surface being convex in a paraxial region
thereof. The second lens element has positive refractive power. The
third lens element has refractive power. The fourth lens element
with refractive power has an image-side surface being concave in a
paraxial region thereof. The fifth lens element with refractive
power has an object-side surface being convex in a paraxial region
thereof. The sixth lens element with refractive power has an
image-side surface being concave in a paraxial region thereof,
wherein the image-side surface of the sixth lens element has at
least one convex shape in an off-axis region thereof, and both of
an object-side surface and the image-side surface of the sixth lens
element are aspheric. The imaging lens system has a total of six
lens elements with refractive power. An air gap in a paraxial
region is between any two of the first lens element, the second
lens element, the third lens element, the fourth lens element, the
fifth lens element and the sixth lens element that are adjacent to
each other. When a curvature radius of the object-side surface of
the fifth lens element is R9, a curvature radius of an image-side
surface of the fifth lens element is R10, a central thickness of
the fifth lens element is CT5, a central thickness of the sixth
lens element is CT6, an axial distance between the fifth lens
element and the sixth lens element is T56, an axial distance
between the object-side surface of the first lens element and an
image surface is TTL, a maximum image height of the imaging lens
system is ImgH, the following conditions are satisfied:
(R9+R10)/(R9-R10)<0.80; 0.70<CT5/(T56+CT6); and
TTL/ImgH<3.0.
According to still another aspect of the present disclosure, an
image capturing unit includes the imaging lens system according to
the aforementioned aspect and an image sensor, wherein the image
sensor is disposed on the image side of the imaging lens
system.
According to yet another aspect of the present disclosure, an
electronic device includes the image capturing unit according to
the aforementioned aspect.
BRIEF DESCRIPTION OF THE DRAWINGS
The disclosure can be more fully understood by reading the
following detailed description of the embodiments, with reference
made to the accompanying drawings as follows:
FIG. 1 is a schematic view of an image capturing unit according to
the 1st embodiment of the present disclosure;
FIG. 2 shows spherical aberration curves, astigmatic field curves
and a distortion curve of the image capturing unit according to the
1st embodiment;
FIG. 3 is a schematic view of an image capturing unit according to
the 2nd embodiment of the present disclosure;
FIG. 4 shows spherical aberration curves, astigmatic field curves
and a distortion curve of the image capturing unit according to the
2nd embodiment;
FIG. 5 is a schematic view of an image capturing unit according to
the 3rd embodiment of the present disclosure;
FIG. 6 shows spherical aberration curves, astigmatic field curves
and a distortion curve of the image capturing unit according to the
3rd embodiment;
FIG. 7 is a schematic view of an image capturing unit according to
the 4th embodiment of the present disclosure;
FIG. 8 shows spherical aberration curves, astigmatic field curves
and a distortion curve of the image capturing unit according to the
4th embodiment;
FIG. 9 is a schematic view of an image capturing unit according to
the 5th embodiment of the present disclosure;
FIG. 10 shows spherical aberration curves, astigmatic field curves
and a distortion curve of the image capturing unit according to the
5th embodiment;
FIG. 11 is a schematic view of an image capturing unit according to
the 6th embodiment of the present disclosure;
FIG. 12 shows spherical aberration curves, astigmatic field curves
and a distortion curve of the image capturing unit according to the
6th embodiment;
FIG. 13 is a schematic view of an image capturing unit according to
the 7th embodiment of the present disclosure;
FIG. 14 shows spherical aberration curves, astigmatic field curves
and a distortion curve of the image capturing unit according to the
7th embodiment;
FIG. 15 is a schematic view of an image capturing unit according to
the 8th embodiment of the present disclosure;
FIG. 16 shows spherical aberration curves, astigmatic field curves
and a distortion curve of the image capturing unit according to the
8th embodiment;
FIG. 17 shows an electronic device according to one embodiment;
FIG. 18 shows an electronic device according to another embodiment;
and
FIG. 19 shows an electronic device according to still another
embodiment.
DETAILED DESCRIPTION
An imaging lens system includes, in order from an object side to an
image side, a first lens element, a second lens element, a third
lens element, a fourth lens element, a fifth lens element and a
sixth lens element. The imaging lens system has a total of six lens
elements with refractive power.
According to the imaging lens system of the present disclosure, an
air gap in a paraxial region is arranged between any two of the
first lens element, the second lens element, the third lens
element, the fourth lens element, the fifth lens element and the
sixth lens element that are adjacent to each other, that is, each
of the first through sixth lens elements of the imaging lens system
is a single and non-cemented lens element. Moreover, the
manufacturing process of the cemented lenses is more complex than
the non-cemented lenses. In particular, an image-side surface of
one lens element and an object-side surface of the following lens
element need to have accurate curvature to ensure these two lens
elements will be highly cemented. However, during the cementing
process, those two lens elements might not be highly cemented due
to displacement and it is thereby not favorable for the image
quality of the photographing optical lens assembly. Therefore,
there is an air gap in a paraxial region between any two of the
first lens element, the second lens element, the third lens
element, the fourth lens element, the fifth lens element and the
sixth lens element that are adjacent to each other in the present
disclosure for solving the problem generated by the cemented lens
elements.
The first lens element with positive refractive power has an
object-side surface being convex in a paraxial region thereof. The
first lens element can have an image-side surface being concave in
a paraxial region thereof. Therefore, the first lens element
provides the imaging lens system with the positive refractive power
as the imaging lens system needs to be. Furthermore, it is
favorable for correcting the astigmatism of the imaging lens
system.
The second lens element with positive refractive power can have an
object-side surface being convex in a paraxial region thereof. The
object-side surface of the second lens element can have at least
one concave shape in an off-axis region thereof. Therefore, it is
favorable for avoiding overloading the positive refractive power on
the lens element close to the object side so as to reduce the
sensitivity of the imaging lens system and correct the aberration
of the off-axis.
The third lens element with refractive power has an image-side
surface being concave in a paraxial region thereof. Therefore, it
is favorable for effectively correcting the aberration of the
imaging lens system.
The fourth lens element with refractive power has an image-side
surface being concave in a paraxial region thereof. The image-side
surface of the fourth lens element can have at least one convex
shape in an off-axis region thereof. Therefore, it is favorable for
balancing the arrangement of the refractive powers of the imaging
lens system and correcting the aberration of the off-axis.
The fifth lens element with positive refractive power has an
object-side surface being convex in a paraxial region thereof, and
the object-side surface of the fifth lens element can have at least
one concave shape in an off-axis region thereof. The fifth lens
element can have an image-side surface being convex in a paraxial
region thereof, and the image-side surface of the fifth lens
element can have at least one concave shape in an off-axis region
thereof. Therefore, it is favorable for avoiding the fifth lens
element having high thickness ratio and correcting the aberration
of the off-axis.
The sixth lens element with negative refractive power can have an
object-side surface being concave in a paraxial region thereof. The
sixth lens element has an image-side surface being concave in a
paraxial region thereof, and the image-side surface of the sixth
lens element has at least one convex shape in an off-axis region
thereof. Therefore, it is favorable for correcting the aberration
of the off-axis.
When a curvature radius of the object-side surface of the fifth
lens element is R9, a curvature radius of the image-side surface of
the fifth lens element is R10, the following condition is
satisfied: (R9+R10)/(R9-R10)<0.80. Therefore, the curvature of
the fifth lens element is properly arranged, so that it is
favorable for avoiding the fifth lens element having high thickness
ratio so as to increase the yield rate. Preferably, the following
condition is satisfied: 0<(R9+R10)/(R9-R10)<0.80.
When a central thickness of the fifth lens element is CT5, a
central thickness of the sixth lens element is CT6, an axial
distance between the fifth lens element and the sixth lens element
is T56, the following condition is satisfied:
0.70<CT5/(T56+CT6). Therefore, the lens elements can be tightly
arranged, so that it is favorable for reducing a total track length
of the imaging lens system so as to keep a compact size.
Preferably, the following condition is satisfied:
1.35<CT5/(T56+CT6). More preferably, the following condition is
satisfied: 1.60<CT5/(T56+CT6)<3.0.
When a focal length of the first lens element is f1, a focal length
of the second lens element is f2, the following condition is
satisfied: f2/f1<1.60. Therefore, it is favorable for avoiding
overloading the refractive power on the lens element close to the
object side so as to reduce the sensitivity of the imaging lens
system.
When an axial distance between the object-side surface of the first
lens element and an image surface is TTL, a maximum image height of
the imaging lens system (half of a diagonal length of an effective
photosensitive area of an image sensor) is ImgH, the following
condition is satisfied: TTL/ImgH<3.0. Therefore, it is favorable
for keeping the imaging lens system compact so as to be equipped in
an electronic device.
When a focal length of the imaging lens system is f, a focal length
of the fifth lens element is f5, a focal length of the sixth lens
element is f6, the following condition is satisfied:
3.0<|f/f5|+|f/f6|<7.5. Therefore, it is favorable for
balancing the arrangement of the refractive powers of the fifth
lens element and the sixth lens element so as to reduce the
sensitivity of the imaging lens system.
When the focal length of the imaging lens system is f, a curvature
radius of the object-side surface of the sixth lens element is R11,
a curvature radius of the image-side surface of the sixth lens
element is R12, the following condition is satisfied:
4.5<(f/R12)-(f/R11)<6.0. Therefore, it is favorable for the
principal point of the imaging lens system being positioned away
from the image side of the imaging lens system and reducing a back
focal length of the imaging lens system.
When an axial distance between the object-side surface of the first
lens element and the image-side surface of the third lens element
is Dr1r6, an axial distance between the image-side surface of the
third lens element and the object-side surface of the fifth lens
element is Dr6r9, the following condition is satisfied:
0.7<Dr1r6/Dr6r9<1.5. Therefore, it is favorable for adjusting
the axial distances between any two adjacent lens elements so as to
reduce the total track length of the imaging lens system.
Preferably, the following condition is satisfied: 0.8<Dr1
r6/Dr6r9<1.2.
When an axial distance between the object-side surface of the first
lens element and the image-side surface of the sixth lens element
is TD, an entrance pupil diameter of the imaging lens system is
EPD, the following condition is satisfied: TD/EPD<2.50.
Therefore, it is favorable for providing sufficient amount of
incident light and keeping the imaging lens system compact.
When the focal length of the imaging lens system is f, a curvature
radius of an object-side surface of the fourth lens element is R7,
a curvature radius of the image-side surface of the fourth lens
element is R8, the following condition is satisfied:
|f/R7|+|f/R8|<0.80. Therefore, it is favorable for correcting
the astigmatism of the imaging lens system and reducing the
sensitivity of the imaging lens system.
When an axial distance between the first lens element and the
second lens element is T12, an axial distance between the second
lens element and the third lens element is T23, an axial distance
between the third lens element and the fourth lens element is T34,
an axial distance between the fourth lens element and the fifth
lens element is T45, the axial distance between the fifth lens
element and the sixth lens element is T56, the following condition
is satisfied: 1.5<(T34+T45)/(T12+T23+T56). Therefore, it is
favorable for adjusting the axial distances between any two
adjacent lens elements so as to reduce the total track length of
the imaging lens system, thereby keeping the imaging lens system
compact.
According to the imaging lens system of the present disclosure, an
aperture stop can be configured as a front stop or a middle stop. A
front stop disposed between an imaged object and the first lens
element can provide a longer distance between an exit pupil of the
imaging lens system and the image surface and thereby improves the
image-sensing efficiency of an image sensor. A middle stop disposed
between the first lens element and the image surface is favorable
for enlarging the field of view of the imaging lens system and
thereby provides a wider field of view for the same.
According to the imaging lens system of the present disclosure, the
lens elements thereof can be made of glass or plastic material.
When the lens elements are made of glass material, the distribution
of the refractive power of the imaging lens system may be more
flexible to design. When the lens elements are made of plastic
material, the manufacturing cost can be effectively reduced.
Furthermore, surfaces of each lens element can be arranged to be
aspheric, since the aspheric surface of the lens element is easy to
form a shape other than spherical surface so as to have more
controllable variables for eliminating the aberration thereof, and
to further decrease the required number of the lens elements.
Therefore, the total track length of the imaging lens system can
also be reduced.
According to the imaging lens system of the present disclosure,
each of an object-side surface and an image-side surface has a
paraxial region and an off-axis region. The paraxial region refers
to the region of the surface where light rays travel close to the
optical axis, and the off-axis region refers to the region of the
surface away from the paraxial region. Particularly, when the lens
element has a convex surface, it indicates that the surface is
convex in the paraxial region thereof; when the lens element has a
concave surface, it indicates that the surface is concave in the
paraxial region thereof. Moreover, when a region of refractive
power or focus of a lens element is not defined, it indicates that
the region of refractive power or focus of the lens element is in
the paraxial region thereof. According to the imaging lens system
of the present disclosure, an image surface of the imaging lens
system, based on the corresponding image sensor, can be flat or
curved, especially a curved surface being concave facing towards
the object side of the imaging lens system.
According to the imaging lens system of the present disclosure, the
imaging lens system can include at least one stop, such as an
aperture stop, a glare stop or a field stop. Said glare stop or
said field stop is set for eliminating the stray light and thereby
improving the image quality thereof.
According to the present disclosure, an image capturing unit is
provided. The image capturing unit includes the imaging lens system
according to the aforementioned imaging lens system of the present
disclosure, and an image sensor, wherein the image sensor is
disposed on the image side of the aforementioned imaging lens
system, that is, the image sensor can be disposed on or near an
image surface of the aforementioned imaging lens system. In some
embodiments, the image capturing unit can further include a barrel
member, a holding member or a combination thereof.
In FIG. 17, FIG. 18 and FIG. 19, an image capturing device 10 may
be installed in, but not limited to, an electronic device,
including a smart phone (FIG. 17), a tablet personal computer (FIG.
18) or a wearable device (FIG. 19). The three exemplary figures of
different kinds of electronic device are only exemplary for showing
the image capturing device of present disclosure installing in an
electronic device and is not limited thereto. In some embodiments,
the electronic device can further include, but not limited to, a
display unit, a control unit, a storage unit, a random access
memory unit (RAM), a read only memory unit (ROM) or a combination
thereof.
According to the imaging lens system of the present disclosure, the
imaging lens system can be optionally applied to moving focus
optical systems. Furthermore, the imaging lens system is featured
with good capability in the correction of aberration and high image
quality, and can be applied to 3D (three-dimensional) image
capturing applications, in products such as digital cameras, mobile
devices, digital tablets, wearable devices, smart televisions,
wireless monitoring devices, motion sensing input devices, driving
recorders, rear view cameras and other electronic imaging devices.
According to the above description of the present disclosure, the
following specific embodiments are provided for further
explanation.
1st Embodiment
FIG. 1 is a schematic view of an image capturing unit according to
the 1st embodiment of the present disclosure. FIG. 2 shows, in
order from left to right, spherical aberration curves, astigmatic
field curves and a distortion curve of the image capturing unit
according to the 1st embodiment. In FIG. 1, the image capturing
unit includes the imaging lens system (its reference numeral is
omitted) of the present disclosure and an image sensor 190. The
imaging lens system includes, in order from an object side to an
image side, a first lens element 110, an aperture stop 100, a
second lens element 120, a third lens element 130, a fourth lens
element 140, a fifth lens element 150, a sixth lens element 160, an
IR-cut filter 170 and an image surface 180, wherein the imaging
lens system has a total of six lens elements (110-160) with
refractive power. There is an air gap in a paraxial region between
any two of the first lens element 110, the second lens element 120,
the third lens element 130, the fourth lens element 140, the fifth
lens element 150 and the sixth lens element 160 that are adjacent
to each other.
The first lens element 110 with positive refractive power has an
object-side surface 111 being convex in a paraxial region thereof
and an image-side surface 112 being concave in a paraxial region
thereof. The first lens element 110 is made of plastic material and
has the object-side surface 111 and the image-side surface 112
being both aspheric.
The second lens element 120 with positive refractive power has an
object-side surface 121 being convex in a paraxial region thereof
and an image-side surface 122 being convex in a paraxial region
thereof. The object-side surface 121 of the second lens element 120
has at least one concave shape in an off-axis region thereof. The
second lens element 120 is made of plastic material and has the
object-side surface 121 and the image-side surface 122 being both
aspheric.
The third lens element 130 with negative refractive power has an
object-side surface 131 being convex in a paraxial region thereof
and an image-side surface 132 being concave in a paraxial region
thereof. The third lens element 130 is made of glass material and
has the object-side surface 131 and the image-side surface 132
being both aspheric.
The fourth lens element 140 with negative refractive power has an
object-side surface 141 being concave in a paraxial region thereof
and an image-side surface 142 being convex in a paraxial region
thereof. The fourth lens element 140 is made of plastic material
and has the object-side surface 141 and the image-side surface 142
being both aspheric.
The fifth lens element 150 with positive refractive power has an
object-side surface 151 being convex in a paraxial region thereof
and an image-side surface 152 being convex in a paraxial region
thereof. The object-side surface 151 of the fifth lens element 150
has at least one concave shape in an off-axis region thereof. The
image-side surface 152 of the fifth lens element 150 has at least
one concave shape in an off-axis region thereof. The fifth lens
element 150 is made of plastic material and has the object-side
surface 151 and the image-side surface 152 being both aspheric.
The sixth lens element 160 with negative refractive power has an
object-side surface 161 being concave in a paraxial region thereof
and an image-side surface 162 being concave in a paraxial region
thereof. The image-side surface 162 of the sixth lens element 160
has at least one convex shape in an off-axis region thereof. The
sixth lens element 160 is made of plastic material and has the
object-side surface 161 and the image-side surface 162 being both
aspheric.
The IR-cut filter 170 is made of glass and located between the
sixth lens element 160 and the image surface 180, and will not
affect the focal length of the imaging lens system. The image
sensor 190 is disposed on or near the image surface 180 of the
imaging lens system.
The equation of the aspheric surface profiles of the aforementioned
lens elements of the 1st embodiment is expressed as follows:
.function..times..times..times..times..function..times..times..times..tim-
es..times. ##EQU00001## where,
X is the relative distance between a point on the aspheric surface
spaced at a distance Y from an optical axis and the tangential
plane at the aspheric surface vertex on the optical axis;
Y is the vertical distance from the point on the aspheric surface
to the optical axis;
R is the curvature radius;
k is the conic coefficient; and
Ai is the i-th aspheric coefficient, and in the embodiments, i may
be, but is not limited to, 4, 6, 8, 10, 12, 14 and 16.
In the imaging lens system of the image capturing unit according to
the 1st embodiment, when a focal length of the imaging lens system
is f, an f-number of the imaging lens system is Fno, and half of a
maximal field of view of the imaging lens system is HFOV, these
parameters have the following values: f=4.81 mm; Fno=2.22; and
HFOV=37.3 degrees.
When a central thickness of the fifth lens element 150 is CT5, a
central thickness of the sixth lens element 160 is CT6, an axial
distance between the fifth lens element 150 and the sixth lens
element 160 is T56, the following condition is satisfied:
CT5/(T56+CT6)=1.41.
When an axial distance between the first lens element 110 and the
second lens element 120 is T12, an axial distance between the
second lens element 120 and the third lens element 130 is T23, an
axial distance between the third lens element 130 and the fourth
lens element 140 is T34, an axial distance between the fourth lens
element 140 and the fifth lens element 150 is T45, the axial
distance between the fifth lens element 150 and the sixth lens
element 160 is T56, the following condition is satisfied:
(T34+T45)/(T12+T23+T56)=2.85.
When an axial distance between the object-side surface 111 of the
first lens element 110 and the image-side surface 132 of the third
lens element 130 is Dr1 r6, an axial distance between the
image-side surface 132 of the third lens element 130 and the
object-side surface 151 of the fifth lens element 150 is Dr6r9, the
following condition is satisfied: Dr1 r6/Dr6r9=0.90.
When a curvature radius of the object-side surface 151 of the fifth
lens element 150 is R9, a curvature radius of the image-side
surface 152 of the fifth lens element 150 is R10, the following
condition is satisfied: (R9+R10)/(R9-R10)=0.52.
When a focal length of the imaging lens system is f, a curvature
radius of the object-side surface 141 of the fourth lens element
140 is R7, a curvature radius of the image-side surface 142 of the
fourth lens element 140 is R8, the following condition is
satisfied: |f/R7|+|f/R81=0.25.
When the focal length of the imaging lens system is f, a curvature
radius of the object-side surface 161 of the sixth lens element 160
is R11, a curvature radius of the image-side surface 162 of the
sixth lens element 160 is R12, the following condition is
satisfied: (f/R12)-(f/R11)=4.80.
When a focal length of the first lens element 110 is f1, a focal
length of the second lens element 120 is f2, the following
condition is satisfied: f2/f1=0.24.
When the focal length of the imaging lens system is f, a focal
length of the fifth lens element 150 is f5, a focal length of the
sixth lens element 160 is f6, the following condition is satisfied:
|f/f51+|f/f61=4.77.
When an axial distance between the object-side surface 111 of the
first lens element 110 and the image surface 180 is TTL, a maximum
image height of the imaging lens system is ImgH, the following
condition is satisfied: TTL/ImgH=1.55.
When an axial distance between the object-side surface 111 of the
first lens element 110 and the image-side surface 162 of the sixth
lens element 160 is TD, an entrance pupil diameter of the imaging
lens system is EPD, the following condition is satisfied:
TD/EPD=2.08.
The detailed optical data of the 1st embodiment are shown in Table
1 and the aspheric surface data are shown in Table 2 below.
TABLE-US-00001 TABLE 1 1st Embodiment f = 4.81 mm, Fno = 2.22, HFOV
= 37.3 deg. Focal Surface # Curvature Radius Thickness Material
Index Abbe # Length 0 Object Plano Infinity 1 Lens 1 2.196 (ASP)
0.397 Plastic 1.544 55.9 15.53 2 2.778 (ASP) 0.088 3 Ape. Stop
Plano 0.018 4 Lens 2 2.376 (ASP) 0.509 Plastic 1.544 55.9 3.66 5
-11.441 (ASP) 0.051 6 Lens 3 25.261 (ASP) 0.300 Glass 1.844 24.8
-4.78 7 3.461 (ASP) 0.499 8 Lens 4 -23.083 (ASP) 0.430 Plastic
1.634 23.8 -45.66 9 -114.780 (ASP) 0.589 10 Lens 5 4.879 (ASP)
0.952 Plastic 1.544 55.9 2.26 11 -1.529 (ASP) 0.225 12 Lens 6
-4.003 (ASP) 0.451 Plastic 1.535 55.7 -1.82 13 1.336 (ASP) 0.750 14
IR-cut filter Plano 0.210 Glass 1.517 64.2 -- 15 Plano 0.401 16
Image Plano -- Note: Reference wavelength is 587.6 nm (d-line),
TABLE-US-00002 TABLE 2 Aspheric Coefficients Surface # 1 2 4 5 6 7
k = -4.8320E-01 -7.7152E+00 -1.0903E+01 -8.7367E+01 -9.0000E+01
5.6179E+00- A4 = -2.5293E-02 -1.1170E-01 -4.5821E-02 -9.7909E-02
-4.7122E-02 -3.3087E-- 02 A6 = 4.0536E-03 1.6113E-02 -1.0036E-01
1.2639E-01 1.8346E-01 1.0157E-01 A8 = -1.6158E-02 1.5387E-02
1.4642E-01 -1.1837E-01 -2.2669E-01 -1.5632E-01- A10 = 4.0160E-03
6.2140E-04 -5.4444E-02 4.5895E-02 1.0651E-01 1.0332E-01 A12 =
1.6293E-06 -3.0737E-03 6.0031E-04 -7.6088E-03 -1.2956E-02
-3.5110E-0- 2 A14 = -3.3851E-10 1.1045E-10 7.8686E-11 -1.5643E-10
-8.8952E-04 5.8677E-03- A16 = -2.8676E-11 7.7362E-12 6.0603E-12
-1.2089E-11 1.6010E-11 -1.4141E-11- Surface # 8 9 10 11 12 13 k =
-8.8459E+01 9.0000E+01 2.1494E+00 -9.6844E+00 2.5786E-01
-8.2314E+00 A4 = -1.2196E-01 -1.3205E-01 -2.0598E-02 -1.5606E-02
-8.9382E-03 -3.1051E-- 02 A6 = 6.1199E-02 6.3427E-02 1.9422E-02
1.0035E-01 3.5669E-02 9.7672E-03 A8 = -3.2032E-02 -4.0686E-02
-1.2558E-02 -6.3732E-02 -2.2725E-02 -2.8101E-- 03 A10 = 2.0845E-02
2.2900E-02 2.1070E-03 1.8924E-02 7.6103E-03 4.5937E-04 A12 =
-3.8188E-03 -4.4894E-03 1.2014E-04 -3.0040E-03 -1.3438E-03
-3.8165E-- 05 A14 = -1.1808E-03 1.3575E-04 -6.4315E-05 2.4339E-04
1.1709E-04 1.3882E-06 A16 = -3.0852E-10 -3.6945E-05 4.7448E-06
-7.8738E-06 -3.9683E-06 -1.3122E-- 08
In Table 1, the curvature radius, the thickness and the focal
length are shown in millimeters (mm). Surface numbers 0-16
represent the surfaces sequentially arranged from the object-side
to the image-side along the optical axis. In Table 2, k represents
the conic coefficient of the equation of the aspheric surface
profiles. A4-A16 represent the aspheric coefficients ranging from
the 4th order to the 16th order. The tables presented below for
each embodiment are the corresponding schematic parameter and
aberration curves, and the definitions of the tables are the same
as Table 1 and Table 2 of the 1st embodiment. Therefore, an
explanation in this regard will not be provided again.
2nd Embodiment
FIG. 3 is a schematic view of an image capturing unit according to
the 2nd embodiment of the present disclosure. FIG. 4 shows, in
order from left to right, spherical aberration curves, astigmatic
field curves and a distortion curve of the image capturing unit
according to the 2nd embodiment. In FIG. 3, the image capturing
unit includes the imaging lens system (its reference numeral is
omitted) of the present disclosure and an image sensor 290. The
imaging lens system includes, in order from an object side to an
image side an aperture stop 200, a first lens element 210, a second
lens element 220, a third lens element 230, a fourth lens element
240, a fifth lens element 250, a sixth lens element 260, an IR-cut
filter 270 and an image surface 280, wherein the imaging lens
system has a total of six lens elements (210-260) with refractive
power. There is an air gap in a paraxial region between any two of
the first lens element 210, the second lens element 220, the third
lens element 230, the fourth lens element 240, the fifth lens
element 250 and the sixth lens element 260 that are adjacent to
each other.
The first lens element 210 with positive refractive power has an
object-side surface 211 being convex in a paraxial region thereof
and an image-side surface 212 being concave in a paraxial region
thereof. The first lens element 210 is made of plastic material and
has the object-side surface 211 and the image-side surface 212
being both aspheric.
The second lens element 220 with positive refractive power has an
object-side surface 221 being convex in a paraxial region thereof
and an image-side surface 222 being concave in a paraxial region
thereof. The object-side surface 221 of the second lens element 220
has at least one concave shape in an off-axis region thereof. The
second lens element 220 is made of plastic material and has the
object-side surface 221 and the image-side surface 222 being both
aspheric.
The third lens element 230 with negative refractive power has an
object-side surface 231 being concave in a paraxial region thereof
and an image-side surface 232 being concave in a paraxial region
thereof. The third lens element 230 is made of plastic material and
has the object-side surface 231 and the image-side surface 232
being both aspheric.
The fourth lens element 240 with positive refractive power has an
object-side surface 241 being convex in a paraxial region thereof
and an image-side surface 242 being concave in a paraxial region
thereof. The image-side surface 242 of the fourth lens element 240
has at least one convex shape in an off-axis region thereof. The
fourth lens element 240 is made of plastic material and has the
object-side surface 241 and the image-side surface 242 being both
aspheric.
The fifth lens element 250 with positive refractive power has an
object-side surface 251 being convex in a paraxial region thereof
and an image-side surface 252 being convex in a paraxial region
thereof. The object-side surface 251 of the fifth lens element 250
has at least one concave shape in an off-axis region thereof. The
image-side surface 252 of the fifth lens element 250 has at least
one concave shape in an off-axis region thereof. The fifth lens
element 250 is made of plastic material and has the object-side
surface 251 and the image-side surface 252 being both aspheric.
The sixth lens element 260 with negative refractive power has an
object-side surface 261 being concave in a paraxial region thereof
and an image-side surface 262 being concave in a paraxial region
thereof. The image-side surface 262 of the sixth lens element 260
has at least one convex shape in an off-axis region thereof. The
sixth lens element 260 is made of plastic material and has the
object-side surface 261 and the image-side surface 262 being both
aspheric.
The IR-cut filter 270 is made of glass and located between the
sixth lens element 260 and the image surface 280, and will not
affect the focal length of the imaging lens system. The image
sensor 290 is disposed on or near the image surface 280 of the
imaging lens system.
The detailed optical data of the 2nd embodiment are shown in Table
3 and the aspheric surface data are shown in Table 4 below.
TABLE-US-00003 TABLE 3 2nd Embodiment f = 4.78 mm, Fno = 1.87, HFOV
= 37.4 deg. Curvature Focal Surface # Radius Thickness Material
Index Abbe # Length 0 Object Plano Infinity 1 Ape. Stop Plano
-0.399 2 Lens 1 2.089 (ASP) 0.534 Plastic 1.544 55.9 11.29 3 2.879
(ASP) 0.125 4 Lens 2 2.641 (ASP) 0.498 Plastic 1.544 55.9 4.97 5
108.327 (ASP) 0.050 6 Lens 3 -41.588 (ASP) 0.307 Plastic 1.650 21.5
-6.44 7 4.672 (ASP) 0.452 8 Lens 4 8.525 (ASP) 0.396 Plastic 1.639
23.5 478.23 9 8.610 (ASP) 0.585 10 Lens 5 5.925 (ASP) 1.152 Plastic
1.544 55.9 2.30 11 -1.481 (ASP) 0.140 12 Lens 6 -4.243 (ASP) 0.492
Plastic 1.544 55.9 -1.83 13 1.359 (ASP) 0.600 14 IR-cut filter
Plano 0.300 Glass 1.517 64.2 -- 15 Plano 0.357 16 Image Plano --
Note: Reference wavelength is 587.6 nm (d-line).
TABLE-US-00004 TABLE 4 Aspheric Coefficients Surface # 2 3 4 5 6 7
k = 2.4189E-01 -2.8203E+00 -1.5018E+01 -8.8779E+01 9.0000E+01
8.6183E+00 A4 = -1.3585E-02 -8.2237E-02 -1.6670E-02 -1.3140E-01
-5.8722E-02 5.5596E-0- 4 A6 = 1.3340E-03 4.8439E-03 -1.2793E-01
1.5366E-01 2.1826E-01 9.9306E-02 A8 = -2.9035E-03 8.9557E-03
1.2202E-01 -1.2304E-01 -2.3697E-01 -1.5345E-01- A10 = -3.7414E-05
1.9917E-03 -3.8992E-02 4.5735E-02 9.4868E-02 9.4768E-02 A12 =
1.5342E-04 -1.5280E-03 2.0959E-03 -7.0274E-03 -4.0783E-03
-2.4645E-0- 2 A14 = 7.1146E-06 7.6787E-06 8.7312E-06 -1.2364E-05
-5.1825E-03 1.2156E-03 A16 = 2.7019E-06 6.9219E-06 1.5208E-07
-2.3904E-05 7.8428E-04 5.2802E-04 Surface # 8 9 10 11 12 13 k =
1.2019E+01 1.2315E+01 6.7186E-01 -8.9684E+00 1.0068E+00 -8.2715E+00
A4 = -1.2024E-01 -1.2415E-01 -2.2184E-02 4.6252E-03 1.3629E-02
-2.7660E-02- A6 = 1.3344E-01 9.9722E-02 2.2355E-02 3.7467E-02
-1.4556E-02 4.3893E-03 A8 = -1.8315E-01 -1.0513E-01 -1.8900E-02
-1.9350E-02 1.1582E-02 -9.5287E-0- 5 A10 = 1.8380E-01 8.0817E-02
7.4009E-03 4.1106E-03 -3.5636E-03 -1.5529E-04 A12 = -1.1444E-01
-3.8688E-02 -2.0625E-03 -3.9329E-04 5.6019E-04 3.2251E-0- 5 A14 =
3.9469E-02 1.0683E-02 3.5969E-04 9.3389E-06 -4.5472E-05 -2.5503E-06
A16 = -5.7245E-03 -1.2742E-03 -2.5866E-05 5.3251E-07 1.5154E-06
7.1544E-08-
In the 2nd embodiment, the equation of the aspheric surface
profiles of the aforementioned lens elements is the same as the
equation of the 1st embodiment. Also, the definitions of these
parameters shown in the following table are the same as those
stated in the 1st embodiment with corresponding values for the 2nd
embodiment, so an explanation in this regard will not be provided
again.
Moreover, these parameters can be calculated from Table 3 and Table
4 as the following values and satisfy the following conditions:
TABLE-US-00005 2nd Embodiment f [mm] 4.78 |f/R7| + |f/R8| 1.12 Fno
1.87 (f/R12) - (f/R11) 4.64 HFOV [deg.] 37.4 f2/f1 0.44 CT5/(T56 +
CT6) 1.82 |f/f5| + |f/f6| 4.69 (T34 + T45)/(T12 + T23 + T56) 3.29
TTL/ImgH 1.57 Dr1r6/Dr6r9 1.06 TD/EPD 1.85 (R9 + R10)/(R9 - R10)
0.60
3rd Embodiment
FIG. 5 is a schematic view of an image capturing unit according to
the 3rd embodiment of the present disclosure. FIG. 6 shows, in
order from left to right, spherical aberration curves, astigmatic
field curves and a distortion curve of the image capturing unit
according to the 3rd embodiment. In FIG. 5, the image capturing
unit includes the imaging lens system (its reference numeral is
omitted) of the present disclosure and an image sensor 390. The
imaging lens system includes, in order from an object side to an
image side, an aperture stop 300, a first lens element 310, a
second lens element 320, a third lens element 330, a fourth lens
element 340, a fifth lens element 350, a sixth lens element 360, an
IR-cut filter 370 and an image surface 380, wherein the imaging
lens system has a total of six lens elements (310-360) with
refractive power. There is an air gap in a paraxial region between
any two of the first lens element 310, the second lens element 320,
the third lens element 330, the fourth lens element 340, the fifth
lens element 350 and the sixth lens element 360 that are adjacent
to each other.
The first lens element 310 with positive refractive power has an
object-side surface 311 being convex in a paraxial region thereof
and an image-side surface 312 being concave in a paraxial region
thereof. The first lens element 310 is made of plastic material and
has the object-side surface 311 and the image-side surface 312
being both aspheric.
The second lens element 320 with positive refractive power has an
object-side surface 321 being convex in a paraxial region thereof
and an image-side surface 322 being convex in a paraxial region
thereof. The object-side surface 321 of the second lens element 320
has at least one concave shape in an off-axis region thereof. The
second lens element 320 is made of plastic material and has the
object-side surface 321 and the image-side surface 322 being both
aspheric.
The third lens element 330 with negative refractive power has an
object-side surface 331 being concave in a paraxial region thereof
and an image-side surface 332 being concave in a paraxial region
thereof. The third lens element 330 is made of plastic material and
has the object-side surface 331 and the image-side surface 332
being both aspheric.
The fourth lens element 340 with negative refractive power has an
object-side surface 341 being convex in a paraxial region thereof
and an image-side surface 342 being concave in a paraxial region
thereof. The image-side surface 342 of the fourth lens element 340
has at least one convex shape in an off-axis region thereof. The
fourth lens element 340 is made of plastic material and has the
object-side surface 341 and the image-side surface 342 being both
aspheric.
The fifth lens element 350 with positive refractive power has an
object-side surface 351 being convex in a paraxial region thereof
and an image-side surface 352 being convex in a paraxial region
thereof. The object-side surface 351 of the fifth lens element 350
has at least one concave shape in an off-axis region thereof. The
image-side surface 352 of the fifth lens element 350 has at least
one concave shape in an off-axis region thereof. The fifth lens
element 350 is made of plastic material and has the object-side
surface 351 and the image-side surface 352 being both aspheric.
The sixth lens element 360 with negative refractive power has an
object-side surface 361 being concave in a paraxial region thereof
and an image-side surface 362 being concave in a paraxial region
thereof. The image-side surface 362 of the sixth lens element 360
has at least one convex shape in an off-axis region thereof. The
sixth lens element 360 is made of plastic material and has the
object-side surface 361 and the image-side surface 362 being both
aspheric.
The IR-cut filter 370 is made of glass and located between the
sixth lens element 360 and the image surface 380, and will not
affect the focal length of the imaging lens system. The image
sensor 390 is disposed on or near the image surface 380 of the
imaging lens system.
The detailed optical data of the 3rd embodiment are shown in Table
5 and the aspheric surface data are shown in Table 6 below.
TABLE-US-00006 TABLE 5 3rd Embodiment f = 4.77 mm, Fno = 2.05, HFOV
= 37.5 deg. Curvature Focal Surface # Radius Thickness Material
Index Abbe # Length 0 Object Plano Infinity 1 Ape. Stop Plano
-0.310 2 Lens 1 2.031 (ASP) 0.445 Plastic 1.544 55.9 9.55 3 3.077
(ASP) 0.118 4 Lens 2 3.327 (ASP) 0.540 Plastic 1.544 55.9 4.61 5
-9.644 (ASP) 0.050 6 Lens 3 -28.208 (ASP) 0.338 Plastic 1.639 23.5
-5.32 7 3.880 (ASP) 0.412 8 Lens 4 10.417 (ASP) 0.423 Plastic 1.639
23.5 -155.93 9 9.282 (ASP) 0.512 10 Lens 5 6.045 (ASP) 1.143
Plastic 1.544 55.9 2.09 11 -1.308 (ASP) 0.114 12 Lens 6 -4.518
(ASP) 0.450 Plastic 1.544 55.9 -1.68 13 1.183 (ASP) 0.600 14 IR-cut
filter Plano 0.210 Glass 1.517 64.2 -- 15 Plano 0.513 16 Image
Plano -- Note: Reference wavelength is 587.6 nm (d-line).
TABLE-US-00007 TABLE 6 Aspheric Coefficients Surface # 2 3 4 5 6 7
k = 3.7656E-02 -4.0572E+00 -2.5726E+01 -7.6552E+00 -9.0000E+01
5.5140E+00 A4 = -1.7569E-02 -9.2509E-02 -4.1328E-02 -1.1402E-01
-6.5178E-02 -2.5542E-- 02 A6 = 4.3248E-04 -3.3325E-03 -1.1159E-01
1.4620E-01 1.9581E-01 9.3731E-02 A8 = -5.5881E-03 1.6583E-02
1.3464E-01 -1.2320E-01 -2.3639E-01 -1.4563E-01- A10 = -8.2100E-04
4.4011E-03 -4.2086E-02 4.6031E-02 1.0653E-01 1.0072E-01 A12 = --
-3.0768E-03 6.0260E-04 -7.6147E-03 -1.2948E-02 -3.5114E-02 A14 = --
-- -- -- -8.8952E-04 5.8677E-03 Surface # 8 9 10 11 12 13 k =
-8.7331E+01 -3.9939E+01 5.8643E+00 -8.3160E+00 1.1301E+00
-8.2477E+00 A4 = -1.0078E-01 -1.1949E-01 -2.8447E-02 8.3327E-03
-1.2301E-02 -4.2869E-0- 2 A6 = 7.0640E-02 7.0091E-02 1.1764E-02
3.3965E-02 -8.1138E-04 1.2146E-02 A8 = -3.6773E-02 -4.3615E-02
-1.0226E-02 -2.2370E-02 4.7591E-03 -2.7789E-0- 3 A10 = 1.6036E-02
2.1956E-02 1.9102E-03 6.2791E-03 -1.4488E-03 4.1577E-04 A12 =
-3.7130E-03 -4.9155E-03 5.1862E-06 -9.2701E-04 1.9505E-04
-3.7929E-0- 5 A14 = -- 3.0277E-04 -1.8662E-05 6.9961E-05
-1.2903E-05 1.9015E-06 A16 = -- -- -- -2.1281E-06 3.4924E-07
-3.9757E-08
In the 3rd embodiment, the equation of the aspheric surface
profiles of the aforementioned lens elements is the same as the
equation of the 1st embodiment. Also, the definitions of these
parameters shown in the following table are the same as those
stated in the 1st embodiment with corresponding values for the 3rd
embodiment, so an explanation in this regard will not be provided
again.
Moreover, these parameters can be calculated from Table 5 and Table
6 as the following values and satisfy the following conditions:
TABLE-US-00008 3rd Embodiment f [mm] 4.77 |f/R7| + |f/R8| 0.97 Fno
2.05 (f/R12) - (f/R11) 5.09 HFOV [deg.] 37.5 f2/f1 0.48 CT5/(T56 +
CT6) 2.03 |f/f5| + |f/f6| 5.12 (T34 + T45)/(T12 + T23 + T56) 3.28
TTL/ImgH 1.55 Dr1r6/Dr6r9 1.11 TD/EPD 1.95 (R9 + R10)/(R9 - R10)
0.64
4th Embodiment
FIG. 7 is a schematic view of an image capturing unit according to
the 4th embodiment of the present disclosure. FIG. 8 shows, in
order from left to right, spherical aberration curves, astigmatic
field curves and a distortion curve of the image capturing unit
according to the 4th embodiment. In FIG. 7, the image capturing
unit includes the imaging lens system (its reference numeral is
omitted) of the present disclosure and an image sensor 490. The
imaging lens system includes, in order from an object side to an
image side, an aperture stop 400, a first lens element 410, a
second lens element 420, a third lens element 430, a fourth lens
element 440, a fifth lens element 450, a sixth lens element 460, an
IR-cut filter 470 and an image surface 480, wherein the imaging
lens system has a total of six lens elements (410-460) with
refractive power. There is an air gap in a paraxial region between
any two of the first lens element 410, the second lens element 420,
the third lens element 430, the fourth lens element 440, the fifth
lens element 450 and the sixth lens element 460 that are adjacent
to each other.
The first lens element 410 with positive refractive power has an
object-side surface 411 being convex in a paraxial region thereof
and an image-side surface 412 being concave in a paraxial region
thereof. The first lens element 410 is made of plastic material and
has the object-side surface 411 and the image-side surface 412
being both aspheric.
The second lens element 420 with positive refractive power has an
object-side surface 421 being convex in a paraxial region thereof
and an image-side surface 422 being convex in a paraxial region
thereof. The object-side surface 421 of the second lens element 420
has at least one concave shape in an off-axis region thereof. The
second lens element 420 is made of plastic material and has the
object-side surface 421 and the image-side surface 422 being both
aspheric.
The third lens element 430 with negative refractive power has an
object-side surface 431 being concave in a paraxial region thereof
and an image-side surface 432 being concave in a paraxial region
thereof. The third lens element 430 is made of plastic material and
has the object-side surface 431 and the image-side surface 432
being both aspheric.
The fourth lens element 440 with positive refractive power has an
object-side surface 441 being convex in a paraxial region thereof
and an image-side surface 442 being concave in a paraxial region
thereof. The image-side surface 442 of the fourth lens element 440
has at least one convex shape in an off-axis region thereof. The
fourth lens element 440 is made of plastic material and has the
object-side surface 441 and the image-side surface 442 being both
aspheric.
The fifth lens element 450 with positive refractive power has an
object-side surface 451 being convex in a paraxial region thereof
and an image-side surface 452 being convex in a paraxial region
thereof. The object-side surface 451 of the fifth lens element 450
has at least one concave shape in an off-axis region thereof. The
image-side surface 452 of the fifth lens element 450 has at least
one concave shape in an off-axis region thereof. The fifth lens
element 450 is made of plastic material and has the object-side
surface 451 and the image-side surface 452 being both aspheric.
The sixth lens element 460 with negative refractive power has an
object-side surface 461 being concave in a paraxial region thereof
and an image-side surface 462 being concave in a paraxial region
thereof. The image-side surface 462 of the sixth lens element 460
has at least one convex shape in an off-axis region thereof. The
sixth lens element 460 is made of plastic material and has the
object-side surface 461 and the image-side surface 462 being both
aspheric.
The IR-cut filter 470 is made of glass and located between the
sixth lens element 460 and the image surface 480, and will not
affect the focal length of the imaging lens system. The image
sensor 490 is disposed on or near the image surface 480 of the
imaging lens system.
The detailed optical data of the 4th embodiment are shown in Table
7 and the aspheric surface data are shown in Table 8 below.
TABLE-US-00009 TABLE 7 4th Embodiment f = 4.94 mm, Fno = 2.05, HFOV
= 36.9 deg. Curvature Focal Surface # Radius Thickness Material
Index Abbe # Length 0 Object Plano Infinity 1 Ape. Stop Plano
-0.357 2 Lens 1 1.977 (ASP) 0.456 Plastic 1.544 55.9 8.48 3 3.178
(ASP) 0.161 4 Lens 2 3.306 (ASP) 0.510 Plastic 1.544 55.9 4.66 5
-10.308 (ASP) 0.052 6 Lens 3 -22.625 (ASP) 0.313 Plastic 1.639 23.5
-4.87 7 3.626 (ASP) 0.375 8 Lens 4 9.179 (ASP) 0.648 Plastic 1.639
23.5 107.95 9 10.296 (ASP) 0.541 10 Lens 5 7.234 (ASP) 1.054
Plastic 1.544 55.9 2.12 11 -1.301 (ASP) 0.091 12 Lens 6 -4.435
(ASP) 0.440 Plastic 1.544 55.9 -1.65 13 1.167 (ASP) 0.600 14 IR-cut
filter Plano 0.210 Glass 1.517 64.2 -- 15 Plano 0.511 16 Image
Plano -- Note: Reference wavelength is 587.6 nm (d-line). Effective
radius of the image-side surface of the second lens element
(surface 5) is 1.260 mm.
TABLE-US-00010 TABLE 8 Aspheric Coefficients Surface # 2 3 4 5 6 7
k = 1.5659E-01 -1.0804E+00 -3.4756E+01 -1.0122E+01 -8.8508E+01
5.4357E+00 A4 = -1.5339E-02 -7.4793E-02 4.1811E-03 -1.0870E-01
-4.8686E-02 -2.3833E-0- 2 A6 = -2.0336E-03 -6.9664E-03 -1.6300E-01
1.2085E-01 1.9409E-01 9.8953E-02 A8 = -3.8295E-03 1.5280E-02
1.6631E-01 -9.7651E-02 -2.4427E-01 -1.5385E-01- A10 = -- --
-5.9939E-02 3.8683E-02 1.2681E-01 1.0265E-01 A12 = -- -- 6.1930E-03
-7.3032E-03 -2.6130E-02 -3.2866E-02 A14 = -- -- -- -- 1.5635E-03
4.9648E-03 Surface # 8 9 10 11 12 13 k = -1.9890E+00 -3.9939E+01
5.2418E+00 -8.3571E+00 1.1967E+00 -8.5250E+00 A4 = -7.4565E-02
-6.9569E-02 -8.9502E-03 7.3297E-02 4.2408E-02 -4.1372E-02- A6 =
4.2138E-02 2.4262E-02 -2.2068E-03 -2.8902E-02 -5.9246E-02
9.0680E-03 A8 = -1.3436E-02 -8.0066E-03 -7.0854E-03 3.6114E-03
3.4638E-02 -1.1766E-03- A10 = 1.3858E-03 4.0015E-03 2.2934E-03
1.1395E-03 -9.3026E-03 5.3330E-05 A12 = -- -7.4029E-04 -1.8598E-04
-4.7956E-04 1.2885E-03 3.5611E-06 A14 = -- -- -- 6.1037E-05
-9.0034E-05 -4.7937E-07 A16 = -- -- -- -2.6308E-06 2.5327E-06
1.4972E-08
In the 4th embodiment, the equation of the aspheric surface
profiles of the aforementioned lens elements is the same as the
equation of the 1st embodiment. Also, the definitions of these
parameters shown in the following table are the same as those
stated in the 1st embodiment with corresponding values for the 4th
embodiment, so an explanation in this regard will not be provided
again.
Moreover, these parameters can be calculated from Table 7 and Table
8 as the following values and satisfy the following conditions:
TABLE-US-00011 4th Embodiment f [mm] 4.94 |f/R7| + |f/R8| 1.02 Fno
2.05 (f/R12) - (f/R11) 5.35 HFOV [deg.] 36.9 f2/f1 0.55 CT5/(T56 +
CT6) 1.98 |f/f5| + |f/f6| 5.32 (T34 + T45)/(T12 + T23 + T56) 3.01
TTL/ImgH 1.57 Dr1r6/Dr6r9 0.95 TD/EPD 1.93 (R9 + R10)/(R9 - R10)
0.70
5th Embodiment
FIG. 9 is a schematic view of an image capturing unit according to
the 5th embodiment of the present disclosure. FIG. 10 shows, in
order from left to right, spherical aberration curves, astigmatic
field curves and a distortion curve of the image capturing unit
according to the 5th embodiment. In FIG. 9, the image capturing
unit includes the imaging lens system (its reference numeral is
omitted) of the present disclosure and an image sensor 590. The
imaging lens system includes, in order from an object side to an
image side, an aperture stop 500, a first lens element 510, a
second lens element 520, a third lens element 530, a fourth lens
element 540, a fifth lens element 550, a sixth lens element 560, an
IR-cut filter 570 and an image surface 580, wherein the imaging
lens system has a total of six lens elements (510-560) with
refractive power. There is an air gap in a paraxial region between
any two of the first lens element 510, the second lens element 520,
the third lens element 530, the fourth lens element 540, the fifth
lens element 550 and the sixth lens element 560 that are adjacent
to each other.
The first lens element 510 with positive refractive power has an
object-side surface 511 being convex in a paraxial region thereof
and an image-side surface 512 being concave in a paraxial region
thereof. The first lens element 510 is made of plastic material and
has the object-side surface 511 and the image-side surface 512
being both aspheric.
The second lens element 520 with positive refractive power has an
object-side surface 521 being convex in a paraxial region thereof
and an image-side surface 522 being convex in a paraxial region
thereof. The object-side surface 521 of the second lens element 520
has at least one concave shape in an off-axis region thereof. The
second lens element 520 is made of plastic material and has the
object-side surface 521 and the image-side surface 522 being both
aspheric.
The third lens element 530 with negative refractive power has an
object-side surface 531 being concave in a paraxial region thereof
and an image-side surface 532 being concave in a paraxial region
thereof. The third lens element 530 is made of plastic material and
has the object-side surface 531 and the image-side surface 532
being both aspheric.
The fourth lens element 540 with positive refractive power has an
object-side surface 541 being convex in a paraxial region thereof
and an image-side surface 542 being concave in a paraxial region
thereof. The image-side surface 542 of the fourth lens element 540
has at least one convex shape in an off-axis region thereof. The
fourth lens element 540 is made of plastic material and has the
object-side surface 541 and the image-side surface 542 being both
aspheric.
The fifth lens element 550 with positive refractive power has an
object-side surface 551 being convex in a paraxial region thereof
and an image-side surface 552 being convex in a paraxial region
thereof. The object-side surface 551 of the fifth lens element 550
has at least one concave shape in an off-axis region thereof. The
image-side surface 552 of the fifth lens element 550 has at least
one concave shape in an off-axis region thereof. The fifth lens
element 550 is made of plastic material and has the object-side
surface 551 and the image-side surface 552 being both aspheric.
The sixth lens element 560 with negative refractive power has an
object-side surface 561 being concave in a paraxial region thereof
and an image-side surface 562 being concave in a paraxial region
thereof. The image-side surface 562 of the sixth lens element 560
has at least one convex shape in an off-axis region thereof. The
sixth lens element 560 is made of plastic material and has the
object-side surface 561 and the image-side surface 562 being both
aspheric.
The IR-cut filter 570 is made of glass and located between the
sixth lens element 560 and the image surface 580, and will not
affect the focal length of the imaging lens system. The image
sensor 590 is disposed on or near the image surface 580 of the
imaging lens system.
The detailed optical data of the 5th embodiment are shown in Table
9 and the aspheric surface data are shown in Table 10 below.
TABLE-US-00012 TABLE 9 5th Embodiment f = 5.01 mm, Fno = 2.05, HFOV
= 36.6 deg. Curvature Focal Surface # Radius Thickness Material
Index Abbe # Length 0 Object Plano Infinity 1 Ape. Stop Plano
-0.378 2 Lens 1 2.047 (ASP) 0.480 Plastic 1.544 55.9 7.28 3 3.887
(ASP) 0.190 4 Lens 2 4.060 (ASP) 0.514 Plastic 1.544 55.9 5.02 6
-7.955 (ASP) 0.050 7 Lens 3 -11.523 (ASP) 0.336 Plastic 1.639 23.5
-4.60 8 3.987 (ASP) 0.393 9 Lens 4 13.882 (ASP) 0.677 Plastic 1.639
23.5 62.15 10 20.937 (ASP) 0.572 11 Lens 5 6.392 (ASP) 0.837
Plastic 1.544 55.9 2.84 12 -1.942 (ASP) 0.268 13 Lens 6 -4.079
(ASP) 0.430 Plastic 1.544 55.9 -2.13 14 1.674 (ASP) 0.600 15 IR-cut
filter Plano 0.210 Glass 1.517 64.2 -- 16 Plano 0.453 17 Image
Plano -- Note: Reference wavelength is 587.6 nm (d-line).
TABLE-US-00013 TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 6 7
k = 3.4342E-01 3.4967E+00 -4.9430E+01 -9.2927E+00 -6.6997E+01
7.3469E+00 A4 = -1.3228E-02 -5.7295E-02 5.5981E-03 -8.4910E-02
-4.2347E-02 -2.9269E-0- 2 A6 = 2.6473E-04 -1.2192E-02 -1.2731E-01
7.3832E-02 1.4122E-01 8.1401E-02 A8 = -6.4689E-03 1.4322E-02
1.1598E-01 -5.3483E-02 -1.6225E-01 -1.0496E-01- A10 = 2.6542E-03 --
-3.4794E-02 1.5058E-02 6.9929E-02 5.2584E-02 A12 = -- -- --
-2.3902E-03 -9.0051E-03 -9.3561E-03 Surface # 8 9 10 11 12 13 k =
6.7084E+01 -3.9939E+01 -9.0000E+01 -8.8133E+00 7.3910E-01
-9.7061E+00 A4 = -8.0610E-02 -7.5871E-02 2.9015E-02 4.4764E-02
-1.1972E-02 -4.0121E-02- A6 = 4.5527E-02 2.6096E-02 -2.2363E-02
4.9392E-03 6.4049E-03 1.1786E-02 A8 = -1.5770E-02 -6.2062E-03
7.3221E-03 -9.0051E-03 -2.5059E-04 -2.6714E-0- 3 A10 = 2.8922E-03
2.4345E-03 -2.7591E-03 2.3730E-03 -6.0510E-05 3.4411E-04 A12 =
-6.1153E-04 -4.3195E-04 5.4624E-04 -2.6497E-04 5.0843E-06
-2.2384E-0- 5 A14 = -- -- -3.6642E-05 1.1111E-05 -- 5.7373E-07
In the 5th embodiment, the equation of the aspheric surface
profiles of the aforementioned lens elements is the same as the
equation of the 1st embodiment. Also, the definitions of these
parameters shown in the following table are the same as those
stated in the 1st embodiment with corresponding values for the 5th
embodiment, so an explanation in this regard will not be provided
again.
Moreover, these parameters can be calculated from Table 9 and Table
10 as the following values and satisfy the following
conditions:
TABLE-US-00014 5th Embodiment f [mm] 5.01 |f/R7| + |f/R8| 0.60 Fno
2.05 (f/R12) - (f/R11) 4.22 HFOV [deg.] 36.6 f2/f1 0.69 CT5/(T56 +
CT6) 1.20 |f/f5| + |f/f6| 4.12 (T34 + T45)/(T12 + T23 + T56) 1.90
TTL/ImgH 1.59 Dr1r6/Dr6r9 0.96 TD/EPD 1.94 (R9 + R10)/(R9 - R10)
0.53
6th Embodiment
FIG. 11 is a schematic view of an image capturing unit according to
the 6th embodiment of the present disclosure. FIG. 12 shows, in
order from left to right, spherical aberration curves, astigmatic
field curves and a distortion curve of the image capturing unit
according to the 6th embodiment. In FIG. 11, the image capturing
unit includes the imaging lens system (its reference numeral is
omitted) of the present disclosure and an image sensor 690. The
imaging lens system includes, in order from an object side to an
image side, an aperture stop 600, a first lens element 610, a
second lens element 620, a third lens element 630, a fourth lens
element 640, a fifth lens element 650, a sixth lens element 660, an
IR-cut filter 670 and an image surface 680, wherein the imaging
lens system has a total of six lens elements (610-660) with
refractive power. There is an air gap in a paraxial region between
any two of the first lens element 610, the second lens element 620,
the third lens element 630, the fourth lens element 640, the fifth
lens element 650 and the sixth lens element 660 that are adjacent
to each other.
The first lens element 610 with positive refractive power has an
object-side surface 611 being convex in a paraxial region thereof
and an image-side surface 612 being concave in a paraxial region
thereof. The first lens element 610 is made of plastic material and
has the object-side surface 611 and the image-side surface 612
being both aspheric.
The second lens element 620 with positive refractive power has an
object-side surface 621 being convex in a paraxial region thereof
and an image-side surface 622 being convex in a paraxial region
thereof. The object-side surface 621 of the second lens element 620
has at least one concave shape in an off-axis region thereof. The
second lens element 620 is made of plastic material and has the
object-side surface 621 and the image-side surface 622 being both
aspheric.
The third lens element 630 with negative refractive power has an
object-side surface 631 being concave in a paraxial region thereof
and an image-side surface 632 being concave in a paraxial region
thereof. The third lens element 630 is made of plastic material and
has the object-side surface 631 and the image-side surface 632
being both aspheric.
The fourth lens element 640 with positive refractive power has an
object-side surface 641 being convex in a paraxial region thereof
and an image-side surface 642 being concave in a paraxial region
thereof. The image-side surface 642 of the fourth lens element 640
has at least one convex shape in an off-axis region thereof. The
fourth lens element 640 is made of plastic material and has the
object-side surface 641 and the image-side surface 642 being both
aspheric.
The fifth lens element 650 with positive refractive power has an
object-side surface 651 being convex in a paraxial region thereof
and an image-side surface 652 being convex in a paraxial region
thereof. The object-side surface 651 of the fifth lens element 650
has at least one concave shape in an off-axis region thereof. The
image-side surface 652 of the fifth lens element 650 has at least
one concave shape in an off-axis region thereof. The fifth lens
element 650 is made of plastic material and has the object-side
surface 651 and the image-side surface 652 being both aspheric.
The sixth lens element 660 with negative refractive power has an
object-side surface 661 being concave in a paraxial region thereof
and an image-side surface 662 being concave in a paraxial region
thereof. The image-side surface 662 of the sixth lens element 660
has at least one convex shape in an off-axis region thereof. The
sixth lens element 660 is made of plastic material and has the
object-side surface 661 and the image-side surface 662 being both
aspheric.
The IR-cut filter 670 is made of glass and located between the
sixth lens element 660 and the image surface 680, and will not
affect the focal length of the imaging lens system. The image
sensor 690 is disposed on or near the image surface 680 of the
imaging lens system.
The detailed optical data of the 6th embodiment are shown in Table
11 and the aspheric surface data are shown in Table 12 below.
TABLE-US-00015 TABLE 11 6th Embodiment f = 5.09 mm, Fno = 2.05,
HFOV = 36.0 deg. Curvature Focal Surface # Radius Thickness
Material Index Abbe # Length 0 Object Plano Infinity 1 Ape. Stop
Plano -0.395 2 Lens 1 2.066 (ASP) 0.481 Plastic 1.544 55.9 7.14 3
4.050 (ASP) 0.220 4 Lens 2 4.189 (ASP) 0.536 Plastic 1.544 55.9
4.63 5 -6.048 (ASP) 0.050 6 Lens 3 -9.576 (ASP) 0.322 Plastic 1.639
23.5 -4.38 7 4.001 (ASP) 0.415 8 Lens 4 21.870 (ASP) 0.800 Plastic
1.639 23.5 120.35 9 30.125 (ASP) 0.539 10 Lens 5 6.152 (ASP) 0.724
Plastic 1.544 55.9 3.08 11 -2.206 (ASP) 0.332 12 Lens 6 -2.715
(ASP) 0.430 Plastic 1.544 55.9 -2.25 13 2.350 (ASP) 0.600 14 IR-cut
filter Plano 0.210 Glass 1.517 64.2 -- 15 Plano 0.392 16 Image
Plano -- Note: Reference wavelength is 587.6 nm (d-line). Effective
radius of the image-side surface of the second lens element
(surface 5) is 1.290 mm.
TABLE-US-00016 TABLE 12 Aspheric Coefficients Surface # 2 3 4 5 6 7
k = 4.4801E-01 7.0126E+00 -4.2914E+01 -3.7070E+01 -8.9992E+01
4.5837E+00 A4 = -1.2204E-02 -4.2678E-02 1.6566E-02 -2.2633E-02
1.8004E-02 -6.0195E-03- A6 = -2.2567E-03 -8.5705E-03 -7.4744E-02
-1.7651E-02 1.2179E-02 2.5721E-02- A8 = -3.0392E-03 6.3871E-03
5.3438E-02 -6.4789E-03 -5.3442E-02 -3.2083E-02- A10 = 1.3542E-03 --
-1.4860E-02 1.0427E-02 3.6053E-02 1.2864E-02 A12 = -- -- --
-3.7063E-03 -6.7525E-03 -- Surface # 8 9 10 11 12 13 k = 6.7878E+01
-3.9939E+01 -9.0000E+01 -8.7895E+00 -1.8394E-01 -1.4255E+01- A4 =
-5.8345E-02 -6.4335E-02 1.9084E-02 2.2891E-02 9.9049E-03
-2.9962E-02 A6 = 2.6571E-02 1.9470E-02 -1.5128E-02 1.9838E-02
8.8569E-04 7.3102E-03 A8 = -7.7902E-03 -4.3003E-03 3.8619E-03
-1.4747E-02 9.3972E-04 -1.5144E-03- A10 = 2.8116E-04 1.5887E-03
-1.8349E-03 3.6089E-03 -1.9870E-04 1.7208E-04 A12 = -- -2.4261E-04
4.1490E-04 -3.9937E-04 1.1865E-05 -9.6939E-06 A14 = -- --
-2.8595E-05 1.6842E-05 -- 2.1755E-07
In the 6th embodiment, the equation of the aspheric surface
profiles of the aforementioned lens elements is the same as the
equation of the 1st embodiment. Also, the definitions of these
parameters shown in the following table are the same as those
stated in the 1st embodiment with corresponding values for the 6th
embodiment, so an explanation in this regard will not be provided
again.
Moreover, these parameters can be calculated from Table 11 and
Table 12 as the following values and satisfy the following
conditions:
TABLE-US-00017 6th Embodiment f [mm] 5.09 |f/R7| + |f/R8| 0.40 Fno
2.05 (f/R12) - (f/R11) 4.04 HFOV [deg.] 36.0 f2/f1 0.65 CT5/(T56 +
CT6) 0.95 |f/f5| + |f/f6| 3.91 (T34 + T45)/(T12 + T23 + T56) 1.58
TTL/ImgH 1.60 Dr1r6/Dr6r9 0.92 TD/EPD 1.95 (R9 + R10)/(R9 - R10)
0.47
7th Embodiment
FIG. 13 is a schematic view of an image capturing unit according to
the 7th embodiment of the present disclosure. FIG. 14 shows, in
order from left to right, spherical aberration curves, astigmatic
field curves and a distortion curve of the image capturing unit
according to the 7th embodiment. In FIG. 13, the image capturing
unit includes the imaging lens system (its reference numeral is
omitted) of the present disclosure and an image sensor 790. The
imaging lens system includes, in order from an object side to an
image side, a first lens element 710, a second lens element 720, an
aperture stop 700, a third lens element 730, a fourth lens element
740, a fifth lens element 750, a sixth lens element 760, an IR-cut
filter 770 and an image surface 780, wherein the imaging lens
system has a total of six lens elements (710-760) with refractive
power. There is an air gap in a paraxial region between any two of
the first lens element 710, the second lens element 720, the third
lens element 730, the fourth lens element 740, the fifth lens
element 750 and the sixth lens element 760 that are adjacent to
each other.
The first lens element 710 with positive refractive power has an
object-side surface 711 being convex in a paraxial region thereof
and an image-side surface 712 being concave in a paraxial region
thereof. The first lens element 710 is made of plastic material and
has the object-side surface 711 and the image-side surface 712
being both aspheric.
The second lens element 720 with positive refractive power has an
object-side surface 721 being convex in a paraxial region thereof
and an image-side surface 722 being concave in a paraxial region
thereof. The object-side surface 721 of the second lens element 720
has at least one concave shape in an off-axis region thereof. The
second lens element 720 is made of plastic material and has the
object-side surface 721 and the image-side surface 722 being both
aspheric.
The third lens element 730 with negative refractive power has an
object-side surface 731 being convex in a paraxial region thereof
and an image-side surface 732 being concave in a paraxial region
thereof. The third lens element 730 is made of plastic material and
has the object-side surface 731 and the image-side surface 732
being both aspheric.
The fourth lens element 740 with positive refractive power has an
object-side surface 741 being convex in a paraxial region thereof
and an image-side surface 742 being concave in a paraxial region
thereof. The image-side surface 742 of the fourth lens element 740
has at least one convex shape in an off-axis region thereof. The
fourth lens element 740 is made of plastic material and has the
object-side surface 741 and the image-side surface 742 being both
aspheric.
The fifth lens element 750 with positive refractive power has an
object-side surface 751 being convex in a paraxial region thereof
and an image-side surface 752 being convex in a paraxial region
thereof. The object-side surface 751 of the fifth lens element 750
has at least one concave shape in an off-axis region thereof. The
image-side surface 752 of the fifth lens element 750 has at least
one concave shape in an off-axis region thereof. The fifth lens
element 750 is made of plastic material and has the object-side
surface 751 and the image-side surface 752 being both aspheric.
The sixth lens element 760 with negative refractive power has an
object-side surface 761 being concave in a paraxial region thereof
and an image-side surface 762 being concave in a paraxial region
thereof. The image-side surface 762 of the sixth lens element 760
has at least one convex shape in an off-axis region thereof. The
sixth lens element 760 is made of plastic material and has the
object-side surface 761 and the image-side surface 762 being both
aspheric.
The IR-cut filter 770 is made of glass and located between the
sixth lens element 760 and the image surface 780, and will not
affect the focal length of the imaging lens system. The image
sensor 790 is disposed on or near the image surface 780 of the
imaging lens system.
The detailed optical data of the 7th embodiment are shown in Table
13 and the aspheric surface data are shown in Table 14 below.
TABLE-US-00018 TABLE 13 7th Embodiment f = 5.02 mm, Fno = 2.25,
HFOV = 36.1 deg. Curvature Focal Surface # Radius Thickness
Material Index Abbe # Length 0 Object Plano Infinity 1 Lens 1 2.145
(ASP) 0.422 Plastic 1.544 55.9 502.16 2 2.012 (ASP) 0.058 3 Lens 2
1.801 (ASP) 0.529 Plastic 1.570 57.0 3.31 4 35.744 (ASP) 0.009 5
Ape. Stop Plano 0.041 6 Lens 3 68.750 (ASP) 0.300 Plastic 1.639
23.5 -6.55 7 3.936 (ASP) 0.664 8 Lens 4 8.062 (ASP) 0.398 Plastic
1.639 23.5 154.55 9 8.609 (ASP) 0.701 10 Lens 5 9.201 (ASP) 1.208
Plastic 1.570 57.0 2.27 11 -1.436 (ASP) 0.050 12 Lens 6 -4.368
(ASP) 0.450 Plastic 1.570 57.0 -1.77 13 1.361 (ASP) 0.600 14 IR-cut
filter Plano 0.300 Glass 1.517 64.2 -- 15 Plano 0.321 16 Image
Plano -- Note: Reference wavelength is 587.6 nm (d-line).
TABLE-US-00019 TABLE 14 Aspheric Coefficients Surface # 1 2 3 4 6 7
k = -1.3983E-01 -5.5598E+00 -8.5113E+00 -1.0000E+00 9.0000E+01
9.2503E+00 A4 = -2.3124E-02 -1.0332E-01 2.9122E-02 -4.8303E-02
-4.5611E-02 -1.6929E-0- 2 A6 = -2.2698E-03 2.4343E-02 -1.1436E-01
6.3024E-02 1.3384E-01 7.2348E-02 A8 = 1.8069E-03 8.3875E-03
1.2437E-01 -5.6175E-02 -1.3707E-01 -9.9469E-02 A10 = -4.9032E-03
7.9787E-03 -4.9634E-02 -5.3081E-03 6.6686E-02 7.2624E-02- A12 =
-3.6837E-04 -8.3822E-03 5.0324E-03 3.7898E-02 -4.0774E-03
-2.4646E-0- 2 A14 = 2.9144E-03 2.9050E-03 1.5270E-03 -2.0934E-02
-5.1825E-03 1.2150E-03 A16 = -8.3079E-04 7.0710E-06 1.7042E-07
3.4646E-03 7.8428E-04 5.2802E-04 Surface # 8 9 10 11 12 13 k =
1.0920E+01 1.6412E+01 5.0501E+00 -9.1952E+00 9.0882E-01 -9.3590E+00
A4 = -8.4711E-02 -8.2970E-02 -2.5637E-02 -4.3336E-03 -1.4765E-02
-3.7977E-- 02 A6 = 9.3727E-02 7.1166E-02 2.2558E-02 3.7423E-02
2.1342E-02 1.3185E-02 A8 = -1.6978E-01 -9.3476E-02 -1.9157E-02
-1.9304E-02 -7.1430E-03 -3.6532E-- 03 A10 = 1.8044E-01 7.4627E-02
7.3993E-03 4.1159E-03 1.3820E-03 6.2090E-04 A12 = -1.1504E-01
-3.5803E-02 -2.0435E-03 -3.9265E-04 -1.5406E-04 -5.9052E- -05 A14 =
3.9709E-02 9.5109E-03 3.6138E-04 9.3772E-06 8.6717E-06 2.8695E-06
A16 = -5.7245E-03 -1.0558E-03 -2.6545E-05 5.1289E-07 -1.7744E-07
-5.5520E-- 08
In the 7th embodiment, the equation of the aspheric surface
profiles of the aforementioned lens elements is the same as the
equation of the 1st embodiment. Also, the definitions of these
parameters shown in the following table are the same as those
stated in the 1st embodiment with corresponding values for the 7th
embodiment, so an explanation in this regard will not be provided
again.
Moreover, these parameters can be calculated from Table 13 and
Table 14 as the following values and satisfy the following
conditions:
TABLE-US-00020 7th Embodiment f [mm] 5.02 |f/R7| + |f/R8| 1.21 Fno
2.25 (f/R12) - (f/R11) 4.84 HFOV [deg.] 36.1 f2/f1 0.01 CT5/(T56 +
CT6) 2.42 |f/f5| + |f/f6| 5.05 (T34 + T45)/(T12 + T23 + T56) 8.64
TTL/ImgH 1.59 Dr1r6/Dr6r9 0.77 TD/EPD 2.16 (R9 + R10)/(R9 - R10)
0.73
8th Embodiment
FIG. 15 is a schematic view of an image capturing unit according to
the 8th embodiment of the present disclosure. FIG. 16 shows, in
order from left to right, spherical aberration curves, astigmatic
field curves and a distortion curve of the image capturing unit
according to the 8th embodiment. In FIG. 15, the image capturing
unit includes the imaging lens system (its reference numeral is
omitted) of the present disclosure and an image sensor 890. The
imaging lens system includes, in order from an object side to an
image side, an aperture stop 800, a first lens element 810, a
second lens element 820, a third lens element 830, a fourth lens
element 840, a fifth lens element 850, a sixth lens element 860, an
IR-cut filter 870 and an image surface 880, wherein the imaging
lens system has a total of six lens elements (810-860) with
refractive power. There is an air gap in a paraxial region between
any two of the first lens element 810, the second lens element 820,
the third lens element 830, the fourth lens element 840, the fifth
lens element 850 and the sixth lens element 860 that are adjacent
to each other.
The first lens element 810 with positive refractive power has an
object-side surface 811 being convex in a paraxial region thereof
and an image-side surface 812 being concave in a paraxial region
thereof. The first lens element 810 is made of plastic material and
has the object-side surface 811 and the image-side surface 812
being both aspheric.
The second lens element 820 with positive refractive power has an
object-side surface 821 being convex in a paraxial region thereof
and an image-side surface 822 being convex in a paraxial region
thereof. The object-side surface 821 of the second lens element 820
has at least one concave shape in an off-axis region thereof. The
second lens element 820 is made of plastic material and has the
object-side surface 821 and the image-side surface 822 being both
aspheric.
The third lens element 830 with negative refractive power has an
object-side surface 831 being concave in a paraxial region thereof
and an image-side surface 832 being concave in a paraxial region
thereof. The third lens element 830 is made of plastic material and
has the object-side surface 831 and the image-side surface 832
being both aspheric.
The fourth lens element 840 with negative refractive power has an
object-side surface 841 being concave in a paraxial region thereof
and an image-side surface 842 being concave in a paraxial region
thereof. The image-side surface 842 of the fourth lens element 840
has at least one convex shape in an off-axis region thereof. The
fourth lens element 840 is made of plastic material and has the
object-side surface 841 and the image-side surface 842 being both
aspheric.
The fifth lens element 850 with positive refractive power has an
object-side surface 851 being convex in a paraxial region thereof
and an image-side surface 852 being convex in a paraxial region
thereof. The object-side surface 851 of the fifth lens element 850
has at least one concave shape in an off-axis region thereof. The
image-side surface 852 of the fifth lens element 850 has at least
one concave shape in an off-axis region thereof. The fifth lens
element 850 is made of plastic material and has the object-side
surface 851 and the image-side surface 852 being both aspheric.
The sixth lens element 860 with negative refractive power has an
object-side surface 861 being concave in a paraxial region thereof
and an image-side surface 862 being concave in a paraxial region
thereof. The image-side surface 862 of the sixth lens element 860
has at least one convex shape in an off-axis region thereof. The
sixth lens element 860 is made of plastic material and has the
object-side surface 861 and the image-side surface 862 being both
aspheric.
The IR-cut filter 870 is made of glass and located between the
sixth lens element 860 and the image surface 880, and will not
affect the focal length of the imaging lens system. The image
sensor 890 is disposed on or near the image surface 880 of the
imaging lens system.
The detailed optical data of the 8th embodiment are shown in Table
15 and the aspheric surface data are shown in Table 16 below.
TABLE-US-00021 TABLE 15 8th Embodiment f = 3.75 mm, Fno = 2.06,
HFOV = 37.6 deg. Curvature Focal Surface # Radius Thickness
Material Index Abbe # Length 0 Object Plano Infinity 1 Ape. Stop
Plano -0.236 2 Lens 1 1.636 (ASP) 0.356 Plastic 1.544 55.9 5.66 3
3.223 (ASP) 0.144 4 Lens 2 3.768 (ASP) 0.578 Plastic 1.544 55.9
4.37 5 -6.106 (ASP) 0.050 6 Lens 3 -8.507 (ASP) 0.250 Plastic 1.639
23.5 -4.98 7 5.136 (ASP) 0.381 8 Lens 4 -67.955 (ASP) 0.304 Plastic
1.639 23.5 -63.57 9 101.170 (ASP) 0.323 10 Lens 5 2.943 (ASP) 0.425
Plastic 1.544 55.9 1.79 11 -1.382 (ASP) 0.095 12 Lens 6 -2.067
(ASP) 0.400 Plastic 1.544 55.9 -1.42 13 1.323 (ASP) 0.500 14 IR-cut
filter Plano 0.300 Glass 1.517 64.2 -- 15 Plano 0.383 16 Image
Plano -- Note: Reference wavelength is 587.6 nm (d-line).
TABLE-US-00022 TABLE 16 Aspheric Coefficients Surface # 2 3 4 5 6 7
k = 1.0220E-01 8.4654E+00 -9.0000E+01 -1.9183E+01 2.5246E+01
-9.0000E+01 A4 = -3.3271E-02 -1.2468E-01 8.9236E-02 -3.3640E-01
-2.9575E-01 2.6630E-02- A6 = -1.0104E-02 2.4856E-03 -3.9396E-01
3.4291E-01 4.4375E-01 6.4214E-02 A8 = -1.6348E-02 -4.6428E-02
6.1178E-01 -2.9587E-01 -5.1248E-01 -1.9209E-0- 1 A10 = --
4.0385E-02 -5.4721E-01 1.3032E-01 4.0005E-01 1.7422E-01 A12 = -- --
2.1381E-01 -2.3333E-02 -1.1132E-01 -4.8291E-02 Surface # 8 9 10 11
12 13 k = 9.0000E+01 -4.1439E+01 -6.8931E+01 -6.8621E+00
-1.1737E-01 -1.0202E+01- A4 = -1.9175E-01 -3.4861E-01 5.5318E-02
1.8592E-01 5.3952E-02 -1.0746E-01 A6 = 1.8507E-01 3.5023E-01
-1.8699E-01 2.4604E-02 3.5706E-02 7.7066E-02 A8 = -1.0489E-01
-3.5701E-01 8.6065E-02 -1.9576E-01 -3.5899E-02 -5.1118E-0- 2 A10 =
-8.7397E-02 3.7095E-01 9.5899E-03 1.2586E-01 1.3782E-02 2.0950E-02
A12 = 3.2644E-02 -3.1350E-01 -6.8885E-02 -3.9562E-02 -2.3748E-03
-4.9039E-- 03 A14 = -- 1.1318E-01 2.6564E-02 7.4733E-03 1.5733E-04
5.9808E-04 A16 = -- -- -- -7.0271E-04 -- -2.9555E-05
In the 8th embodiment, the equation of the aspheric surface
profiles of the aforementioned lens elements is the same as the
equation of the 1st embodiment. Also, the definitions of these
parameters shown in the following table are the same as those
stated in the 1st embodiment with corresponding values for the 8th
embodiment, so an explanation in this regard will not be provided
again.
Moreover, these parameters can be calculated from Table 15 and
Table 16 as the following values and satisfy the following
conditions:
TABLE-US-00023 8th Embodiment f [mm] 3.75 |f/R7| + |f/R8| 0.09 Fno
2.06 (f/R12) - (f/R11) 4.65 HFOV [deg.] 37.6 f2/f1 0.77 CT5/(T56 +
CT6) 0.86 |f/f5| + |f/f6| 4.74 (T34 + T45)/(T12 + T23 + T56) 2.44
TTL/ImgH 1.50 Dr1r6/Dr6r9 1.37 TD/EPD 1.82 (R9 + R10)/(R9 - R10)
0.36
The foregoing image capturing unit is able to be installed in, but
not limited to, an electronic device, including smart phones,
tablet personal computers and wearable apparatus. According to the
present disclosure, both of the first lens element and the second
lens element have positive refractive power. Therefore, it is
favorable for avoiding overloading the positive refractive power on
the lens element close to the object side so as to reduce the
sensitivity of the imaging lens system. The object-side surface of
the fifth lens element is convex in a paraxial region thereof.
Therefore, it is favorable for avoiding the fifth lens element
having high thickness ratio.
The foregoing description, for the purpose of explanation, has been
described with reference to specific embodiments. It is to be noted
that TABLES 1-16 show different data of the different embodiments;
however, the data of the different embodiments are obtained from
experiments. The embodiments were chosen and described in order to
best explain the principles of the disclosure and its practical
applications, to thereby enable others skilled in the art to best
utilize the disclosure and various embodiments with various
modifications as are suited to the particular use contemplated. The
embodiments depicted above and the appended drawings are exemplary
and are not intended to be exhaustive or to limit the scope of the
present disclosure to the precise forms disclosed. Many
modifications and variations are possible in view of the above
teachings.
* * * * *